The mystery of implementing this with a 1&1 Shop is finding the URL to enter into Paypal for the user to auto return to the store. After finding nothing online after researching, I began trying URL's and checking out from my own store to see if it worked (expensive process). The information your looking for to autoreturn to your 1&1 eZshop or 1&1 webstore is:

https://ssl.perfora.net/yourwebsite.com/shop/cart/view?shop_param=

Cut and paste the line above into Paypal's site, and substitute the name of yourwebsite.com.

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About the Author

Scott Steiger is an engineer, product line manager, and business unit manager who has built, managed, and runs worldwide advertising campaigns on Google, Yahoo, and Bing, and performed Search Engine Optimization for his employer. He has developed several of his own sites.
He has seen the Online Advertising world from both sides and desires to bring value to both advertisers and publishers through the information offered on this site.